Control strategy of wind energy conversion system based on H‐MMC under asymmetrical grid faults. Issue 12 (16th September 2019)

• Record Type: Journal Article
• Authors: Rong, Fei; Yan, Jiajun; Sun, Wenlong; Huang, Sheng; Wu, Qiuwei
• Is Part Of: IET power electronics. Volume 12:Issue 12(2019)
• Page Start: 3149
• Page End: 3157
• Publication Date: 2019-09-16
• Subjects: power grids -- wind turbines -- power generation faults -- wind power plants -- power generation control -- HVDC power convertors -- voltage‐source convertors -- power conversion harmonics -- power capacitors; H‐MMC -- wind turbine -- AC grid -- low power losses -- low ripple -- capacitor voltage -- positive sequence control method -- negative sequence control method -- asymmetrical grid faults -- double proportional resonant controller -- control strategy -- wind energy conversion system -- hexagonal modular multilevel converter -- transformer‐less grid connection -- one stage conversion; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2019.0108
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : This study proposes a topology of wind energy conversion system based on hexagonal modular multilevel converter (H‐MMC), which can connect the wind turbine and the AC grid with one stage conversion. It has the advantages of low power losses, low ripple of capacitor voltage and transformer‐less grid connection. The operation principle of the proposed topology is analysed in detail. Then, the positive and negative sequence control method is proposed to eliminate the second harmonics in the output power of H‐MMC under asymmetrical grid faults. The double proportional resonant (PR) controller is proposed to track arm current references without steady error. The effectiveness of the proposed topology and its control method are verified by simulations and hardware in loop tests.